chore: change row and column variable names in SimpleQuery example (#3059)

* Changed the names of the row and column variables to make their purpose clear.

* Changed the code sample to reflect the real life usage

* Updated the query and column names

* Attempt to fix formatting.

* Modified the IT test to match the query in the sample.

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: PhongChuong <[email protected]>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 3 people

samples/snippets/src/main/java/com/example/bigquery/SimpleQuery.java

@@ -17,6 +17,7 @@
 package com.example.bigquery;
 
 // [START bigquery_query]
+
 import com.google.cloud.bigquery.BigQuery;
 import com.google.cloud.bigquery.BigQueryException;
 import com.google.cloud.bigquery.BigQueryOptions;
@@ -27,7 +28,9 @@ public class SimpleQuery {
 
   public static void main(String[] args) {
     // TODO(developer): Replace this query before running the sample.
-    String query = "SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
+    String query =
+        "SELECT corpus, count(*) as corpus_count "
+            + "FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
     simpleQuery(query);
   }
 
@@ -44,7 +47,14 @@ public static void simpleQuery(String query) {
       TableResult result = bigquery.query(queryConfig);
 
       // Print the results.
-      result.iterateAll().forEach(rows -> rows.forEach(row -> System.out.println(row.getValue())));
+      result
+          .iterateAll()
+          .forEach(
+              row -> {
+                System.out.print("corpus:" + row.get("corpus").getStringValue());
+                System.out.print(", count:" + row.get("corpus_count").getLongValue());
+                System.out.println();
+              });
 
       System.out.println("Query ran successfully");
     } catch (BigQueryException | InterruptedException e) {

samples/snippets/src/test/java/com/example/bigquery/SimpleQueryIT.java

@@ -51,7 +51,9 @@ public void tearDown() {
 
   @Test
   public void testSimpleQuery() {
-    String query = "SELECT corpus FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
+    String query =
+        "SELECT corpus, count(*) as corpus_count "
+            + "FROM `bigquery-public-data.samples.shakespeare` GROUP BY corpus;";
 
     SimpleQuery.simpleQuery(query);
     assertThat(bout.toString()).contains("Query ran successfully");